Please note: The Delaware Historical Society Research Library will be closed through Friday, March 2, 2018 for maintenance and special projects. While staff are unable to accept online research requests during this period, researchers can access our online catalog, Ask Caesar. For your convenience, the library will remain open at the following times:

Thank you for your patience and continued interest in the Delaware Historical Society. Our library staff looks forward to serving you when we resume normal operating hours (listed below) on Monday, March 5, 2018.

Collecting and preserving Delaware materials for over 150 years, the Society has a rich and varied collection of books, ephemera, newspapers, serials, maps, manuscripts and photographs relating to the history of Delaware and its people. The Society's online catalog includes books, rare books, pamphlets, newspapers, maps, manuscripts, and photograph collections. Click here for a brief listing of our Library Collections.